Treatment of glass fibers with 4, 4&#39;-bis(p-hydroxyphenyl)-pentanoic acid



United States Patent Gh Patented 3.2225 2? Material: Average break in pounds A. Untreated cord- 2984586 Tested dry 12.6 TREATMENT OF GLASS FIBERS WITH 4,4'-BIS- Tested wet 6.8

(p-HYDROXYPHENYL)-PENTANOIC ACID 5 B. Treated cord- Archie W. K0011, Auburn, N.Y., assignor to Colombian gi a dry Rope Company, Auburn, N.Y., a corporation of New We ays O dry York Tested wet 7.8 No Drawing. Filed Dec. 30, 1959, Ser. No. 862,785 Example 11 The same procedure was employed as set forth in 5 Clalms' 117 126) Example I except a 10 ply cord was used, namely, size 150-4-10. This invention is related to the coating of glass fibers The test results were as follows:

and more particularly to the application of 4,4- -(P- 15 i ly yp y )-p acid to glass fibers- A llntreated cord- It ha been observed that glass fibers are very strong Tested dry 94 h freshly un even surpassing omp Steel Tested wet u 67 fib It ha also been noted that these glass fibers upon B Treated cord exposure to air or on being twisted into fibers, shortly I Fresh dry 143 lose h f their original strengthh marked Five days old dig n 141 Cline in the strength of the glass fibers pp to be Average break in pounds due to mage of the fiber or filament surfa In the Tested Wet 4 case of atmospheric deterioration of the fiber, this is The foregoing examples are Presented merely as yp p bably d e principally to the water vapor present plus 2 illustrations of the process of the present invention and other chemically reactive foreign substances which are it is not intended that the invention is to be limited generally found in the air in minor amounts. Although therebythe reaction of the chemically active substance may be Although The baking conditions are given as being very localized, a Weakness has been developed in the tes at 320 F., it is to be understood that the time filament where stresses can concentrate and as a result 30 j be Shortened if higher temperatures are used p he fiber is no longer capable of u i i hi mechanvrded these temperatures are not of such intensity as to ical loads. Where the fibers are twisted together, an efifect deleteriously the fiber or to decompose the acid apparent mechanical abrasion of the fibers takes place Coatlnge 011 the other hand e bakihg temperatures where the fibers contact one another such that again b be employflb but longer baklIlg P d Will be reareas of weakness are formed which ultimately result in qb h s ther than ethanol can b d t th fibers having reduced h i l Strength dissolve the acid provlded the solvent does not corrode T overcome h afor ti d Weaknesses Which the glass fiber filament or cord. The present invention develop in glass fibers of filaments, various coating d is equally applicable to individual glass filaments or fibers surface treatments have been devised for glass filaments, as 18 to a Plurallty 0f fibers grouped together u h as some of which have been found to be commercially 40 cords Strandsfeasible. Among those which have been found useful Vanous methods can T to P p the i are certain organic hydroxyl derivatives. However, they (pfhydfoxyphenyl) 'Pentanolc acld- Y Way of P have also been found to have certain limitations including i T y be P epared y hg P l With levubeing excessively corrosive, having only a temporary lime acid in the presence of a mineral acid (J. Am. elfect, or prohibitively expensive. h- 4455-6, I

Accordingly it is an object of this invention to provide It 18 to be unde'rstoofi That -b mildlfications can an improved and economical method for coating glass be by $1$111ed The art Wltholl? dePaI'hng from fibers or filaments. A further object of this invention is SP1rlt of my mvelltlon as efine 1n the following to provide a method for coating glass filaments or fibers clalmsg for the purpose of enhancing their tensile strength. These 1mm: and other objects of the invention will be apparent from The method of produclllg C ted glass fibers comh description which f ll prising passing a glass fiber through a solution of 4,4-

The novel process of this invention comprises reacting b Y 2r acid and thereafter a glass filament or a plurality of glass filaments, such as mg Sald Solutlon on said fibera cord with a Solution of 44, (p hydroxyphenyn The method of producing coated glass fibers compentanoic acid and thereafter baking the solution onto pnsmg passmg a glass fiber through Solutlon of the fib or col-CL bis(p-hydroxyphenyl)-pentanoic acid and drying said The present invention will be more completely undercoated fiber at a for about 30 minutesstood by reference to the following examples. In each amele of manufacture: glass F coated instance all parts and percentages are by weight unless y i acld' otherwise noted 4. The article of claim 3 1n which the ratio by weight Example I of ciriio ti) 4,4'-bis-(p-hydroxyphenyl)-pentanoic acid is a on A glass 00rd, 8126 Was Passed through a 40% 5. In a method of producing coated glass fibers charsolution of 4,4'-bis-(p-hydroxyph y )-Pentanoic acid in acterized by havin im roved tensile stren h the ste 94% ethanol that is, the etha ol contained 6% water comprising passing a g l ass fiber through a solution s; y h T glass 00rd Picked P about 0f 4,4'-bis-(p-hydroxyphenyl)-pentanoic acid and thereafter the acid by weight, that is, each 10 lbs. of glass cord was drying d baking aid solution on said fiber.

coated with about 1 lb. of the acid. The product was R f then dried and baked thirty minutes at 320 F. The e Cted the file fth1s Patent results of tensile strength tests on untreated cords and UNITED STATES PATENTS those treated with the above acid were as follows: 2,933,520 Bader Apr. 19, 1960 

1. THE METHOD OF PRODUCING COATED GLASS FIBERS COMPRISING PASSING A GLASS FIBER THROUGH A SOLUTION OF 4,4''BIS-(P-HYDROXYPHENYL)-PENTANOIC ACID AND THEREAFTER BAKING SAID SOLUTION ON SAID FIBER. 